Owners of Xiaomi and Redmi devices often face a situation where the smartphone starts to run slower, and notifications of space shortages appear more often, not just an accidental failure, but the result of the accumulation of huge amounts of digital debris that is generated during everyday use of the gadget. System memory fills up unnoticed, but its lack critically affects the stability of the MIUI or HyperOS operating system.
Understanding which files and processes are taking up precious gigabytes is the first step to optimizing your device. Many users mistakenly believe that deleting photos solves the problem, but often the root of the evil lies deeper — in hidden system logs, app cache and duplicate install packages. misc_data, which is a unique feature of Xiaomi firmware, and explain how to safely free up space.
You don't have to be a tech person to understand your phone's storage structure, but we'll look at both standard cleaning tools and more advanced file system management techniques, and good space management will extend your gadget's life and avoid annoying interface freezes.
System cache and temporary application files
The main consumer of free space in most cases is the cache of applications, which is temporary data that programs save for faster downloading of content when re-accessed. Social networks such as Telegram, WhatsApp and Instagram can accumulate gigabytes of images, videos and voice messages, even if you have already viewed and deleted them from chats.
Caching works like a buffer zone: the more you use an application, the more space it takes up. The problem is that standard cleaning mechanisms don't always effectively delete this data, especially if the application is actively used in the background. Often users notice that after cleaning the place again ends in a couple of days - it's a normal data collection mechanism that requires regular monitoring.
Special attention should be paid to messengers, as they often store media files not only in their internal database, but also duplicate them into a common gallery, which creates a double memory consumption effect. To check and clean, you need to go to the storage settings and analyze the list of the most “heavy” programs.
- 📱 Messengers (Telegram, WhatsApp) – often take up to 40% of all memory.
- 🎥 Streaming services (YouTube, Netflix) – cache of watched videos and offline content.
- 🛒 Marketplaces and browsers - saved miniatures of goods and pages for quick access.
- 🎮 Games – boot screens, textures and session time logs.
⚠️ Note: When cleaning the cache through the application settings, it is important not to confuse the "Clear Cache" button with the "Erase Data" button. The second action will completely delete your correspondence, logins and settings of the program, returning it to the state immediately after installation.
Regularly checking the list of installed applications will help identify hidden memory eaters. Sometimes old programs that you haven't used in a long time continue to collect data in the background. Deleting such sleeper applications is an easy way to instantly free up several hundred megabytes.
.thumbnails folder and hidden thumbnails
One of the most famous problems in the Android ecosystem, and in particular on Xiaomi smartphones, is the.thumbnails folder, which is located along the path of DCIM/.thumbnails, and is designed to store thumbnails of all images and videos ever in the gallery, so that when you open an album, previews of images are downloaded instantly.
The main feature of this folder is that it is hidden (denoted by a dot at the beginning of the name) and has the ability to grow to a giant size. Even if you deleted the original photo from the gallery, its thumbnail can remain in this directory. Over time, the folder can reach 5-10 GB or more, which is a significant part of the available memory of budget Redmi models.
Deleting the contents of this folder is safe for the system, but one thing to know is that the next time you open the gallery, the system will recreate thumbnails for existing photos, which can temporarily load the processor. However, if the folder has grown to an inadequate size, cleaning it is a mandatory procedure.
How to find the hidden folder.thumbnails?
There's a way to prevent this folder from overgrowth by creating a locking file, and it's an advanced method that requires care, but it effectively stops the garbage from accumulating.
adb shell touch /storage/emulated/0/DCIM/.thumbnails/.nomediaUsing a command via ADB or creating an empty file with the same name as a folder but with a file extension can limit functionality, so it’s easier to just regularly monitor its size through the file manager. For most users, just check the volume of this directory once a month and clean it manually.
Residual files after deleting applications
When you delete an app in the standard way, the Android operating system often leaves behind tails, which can be error logs, temporary configuration files, or downloaded updates that are no longer needed. On Redmi smartphones, these files are usually hidden in the root directory of internal memory or in the Android/data and Android/obb folder.
Not only do residual files take up space, they can also create conflicts when you re-install the same program. For example, if you delete a game to make room and then decide to download it again, the old cache can lead to startup errors. Regularly "revisioning" the file system helps maintain order.
Graphics editors, navigators and games with heavy graphical content leave a lot of garbage, creating separate directories with their own name at the root of the memory, and after deleting the application itself, these folders often remain hanging dead weight.
☑️ Checking for debris
You can use Xiaomi's built-in Security app to find these files, but it doesn't always find all the leftovers, it's more efficient to manually browse through Explorer, and look for folders with the names of remote programs or services that you no longer use.
MIUI system folder and debugging logs
Shell MIUI (And the new HyperOS has its own specifics of logging and error reporting. MIUI -> debug_log If your phone has crashed frequently or you’ve been actively testing new features, the size of those logs can be significant.
There is also a backup folder that can store backups of a system or applications that have been created long ago and forgotten by the user. Checking the MIUI/backup/AllBackup path often identifies old backups that take up gigabytes. They can be safely deleted if you don't need a current copy or have already saved it on your computer.
Another important aspect is the debugging log, which can be turned on by default in some builds or activated by the user, and it records every action of the system, which is useful for developers, but useless for the average user and extremely costly for memory.
| Type of data | Location. | Can I remove it? | Impact on the system |
|---|---|---|---|
| Logs of debugging | MIUI/debug_log | Yes. | Safe, free up space. |
| Backup copies | MIUI/backup/AllBackup | Yes (if you don't need to) | Removing backup history |
| Cash topics. | MIUI/theme | Carefully. | Maybe you can drop the topic to standard. |
| Temporary files | Cache (root) | Yes. | Completely safe. |
Cleaning system logs is a safe procedure that will not affect personal data, contacts or photos. However, by removing folders with the names of installed applications in the root, make sure that you do not touch the data of current programs.
Duplicate downloads and folder Download
Download is a black hole that drains everything a user has ever downloaded from the Internet. APK, PDF-documents, stored images from browsers and attachments from mail often lie there for years, and many people forget that the app installer stays in memory even after the program has been successfully installed.
Browsers by default save everything to this directory, and if you're used to downloading files for later, but you never get to them, they keep taking up space, especially with video files and archives.
- 📦 APK-Files: After installing the application, the installation package is no longer needed, it can be removed.
- 📄 Documents: Old tickets, checks and instructions are often duplicated in different formats.
- 🖼️ Images: Pictures saved from social media often duplicate those already in the gallery.
It is recommended to review the download folder once a month, sorting the files by size will help you quickly find the heaviest objects that can be removed without regret, and often this is where forgotten movies or TV shows downloaded for a trip that has already passed.
Automatic download cleaning is available in some versions of Xiaomi’s Explorer app.The Cleanup feature often highlights old installation packages, prompting them to be removed.It’s one of the easiest ways to make room quickly.
Garbage from social networks and messengers
Social media is the leader in memory consumption, and it's not just about cache, but apps like TikTok, Likee, or Instagram create huge temporary files to preview your feed, and if you scroll through your tape for a long time, your phone stores those videos in temporary storage.
In messengers, the situation is aggravated by the auto-save function, WhatsApp and Viber by default enable auto-save all received media files in the phone gallery, which means that the same picture can be stored in the messenger database, in the shared gallery and in the cache of the system.
To solve the problem, you need to go to the settings of each messenger separately. In the Data and Storage section (or similar), you can turn off autosave to the gallery and set up automatic cleaning of media files. For example, Telegram has a built-in Memory Use feature where you can set an automatic cache cleanup in 3 days or a week.
⚠️ Before mass cleaning of media files in messengers, make sure that important documents or photos are saved in the cloud or on your computer. irrevocable deletion from the chat will delete the file from the server (unless cloud storage of history is enabled).
It's also worth checking the folders of specific social networks in the file manager, for example, TikTok can save draft videos that weigh a lot but have never been published, and delete them safely and efficiently.
Use of cloud services and memory cards
The most radical but effective way to combat memory shortages is to move data to external storage. Google Photos allows you to free up space on your device by removing images already uploaded to the cloud. Xiaomi also actively promotes the Mi Cloud cloud, which synchronizes contacts, notes and photos.
If your Redmi model supports microSD card installation, it can be a lifesaver. Although modern versions of Android limit the ability to install apps on the card, storing photos, videos and music there can and should be done, it will relieve the internal drive, which is critical for system performance.
Using cloud storage requires a stable Internet connection, but it guarantees data security even in the event of a phone breakdown.
💡
Use the "Free Space" feature in Google Photos, which automatically removes from your device those images that have already been successfully uploaded to the cloud and have a backup, which is safe and fast.
Remember that overflowing memory is not only an inconvenience, it is also a risk of data loss: When a system has nowhere to write temporary files, it can start to work incorrectly, close applications or even restart. Regular hygiene of digital space is the key to the long life of your gadget.